Answer:
B
Explanation:
x² + 9x
to complete the square
add ( half the coefficient of the x- term )² to x² + 9x
= x² + 2( )x + ( )²
= x² + 9x + ← the value of c
= (x + )² ← a perfect square
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)x + ( )²
← the value of c )² ← a perfect square